[SOLVED] One core at 98%

[alexisvx]

Hi All,
I recently upgraded my CPU and mobo to an i7-9700k.

HWM monitor shows that on idle, on the Utilization section, one of my CPU cores runs between 80% to 98% while the others are between 1% to 28%. I tried rebooting and the core that runs high keeps changing, i.e. it's not always the same core that runs so high.

I've started the process of overclocking and thought it might be linked to that but even when resetting to stock settings the same thing is happening. My temps are fine.

Is this normal behavior or could this be a faulty processor or bios settings?

Thanks


My Rig:
CPU: i7-9700k
GPU: GTX 1080FTW2 Gaming iCX
Motherboard: Z390 Aorus Ultra
CPU cooler: Noctua NH-D14
PSU: EVGA 750W ATX12V
RAM: Corsair Vengence LPX - 16GB (DDR4 3000)
Monitor: 34 inch @ 3440x1440 Asus ROG PG348Q
Case: Fractal Design Define R4
Windows 10

 

[velocityg4]

Probably just some single threaded process which is running. It doesn't matter how many cores you have. A single threaded process will use just one.

 

[InvalidError]

As velocity wrote, a single-threaded process (or anything that does a disproportionate amount of its total processing in only one thread) will use mostly only one core.

 

[drivinfast247]

You did fresh install Windows, correct?

 

[alexisvx]

I looked at task manager and the only 'heavy' process is icloud photo library which uses 19% of the CPU, after that it's icloud with 3.4% and all else is negligible.
Is this normal for the CPU to be at 90%usage on one thread?

 

[InvalidError]

Is this normal for the CPU to be at 90%usage on one thread?

If the iPhoto app most of its stuff on one thread and is supposed to be doing stuff at the time, yes, a mostly single-threaded application will mostly use a single core to whatever percentage it needs to get whatever it is doing done.

 

[alexisvx]

After killing iPhoto, CPU usage went to almost 0%.

I find it incredible that an app from a developer such as Apple would be so poorly optimized.

 

[InvalidError]

Maybe the app got hung on processing some bad data or ran into some other weirdness. Can happen to any software.